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The first stable compound of Kreb’s cycle is _____________

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The first stable compound of Kreb’s cycle is _____________

(a) Citrate

(b) Cis- Aconitate

(c) Oxaloacetate

(d) Malate

I had been asked this question in an international level competition.

My question is from Mitochondrial Structure and Function in division Mitochondrial Structure and Function of Cell Biology

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Best answer
The correct choice is (a) Citrate

The best explanation: Kreb’s cycle has Citrate as its first stable compound. That is why it is also called Citric Acid Cycle. Citrate is a compound containing three carboxylic acid groups and it is thus also called Tricarboxylic Acid cycle or TCA cycle.

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